title: Second-order Mach bands: chromatic and achromatic.
abstract: Achromatic second-order (contrast) Mach bands can be perceived near the contrast ramp between two contrast levels. In this study we show that a repertoire of chromatic second-order Mach bands is also clearly perceived, under equal-luminance conditions (minimum motion technique). The results show that chromatic and achromatic second-order stimuli yield significant perceived second-order Mach bands, with approximately the same relative magnitude. At high spatial frequencies the effect is more prominent for achromatic second-order Mach bands stimuli than for chromatic second-order stimuli. The effect of the chromatic second-order Mach bands is smaller for complementary pairs of colors than for non-complementary pairs of colors. We suggest that the effect of second-order Mach bands is an expression of the mechanism of second-order induction.
authors.affiliation: Department of Biomedical Engineering, Faculty of Engineering, Tel-Aviv University, 69978 Tel-Aviv, Israel. tsofim@gmail.com
authors.forename: Avital
authors.initials: A
authors.lastname: Tsofe
authors.forename: Hedva
authors.initials: H
authors.lastname: Spitzer
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology; D000328:Adult; D003118:Color Perception / Q000502:physiology*; D015350:Contrast Sensitivity / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D010775:Photic Stimulation / Q000379:methods; D055815:Young Adult